THE DEVELOPMENT OF THE SYMPATHETIC 

 NERVOUS SYSTEM IN TURTLES 



ALBERT KUNTZ 



From the Laboratories of Animal Biology of the State University of Iowa 



THIRTEEN FIGURES 



CONTENTS 



Introduction 279 



Observations 281 



Sympathetic trunks 281 



a Development 281 



b Histogenetic relationships ' 294 



Prevertebral plexuses 295 



Genital plexuses 299 



Vagal sympathetic plexuses 299 



a Introductory 299 



b Myenteric and submucous plexuses 299 



c Pulmonary plexuses 302 



d Cardiac plexus 302 



e Histogenetic relationships 303 



Discussion 305 



Summary • 309 



Bibliography 312 



INTRODUCTION 



The present series of observations on the development of the 

 sympathetic nervous system in turtles represents a continuation 

 of the writer's investigation of the development of the sympa- 

 thetic nervous system in vertebrates. The observations set forth 

 in the present paper are based on embryos of Thalassochelys 

 caretta (loggerhead turtle) and of Chelydra serpentina (snapping 

 turtle) , 



Embryos of Thalassochelys caretta develop more slowly and 

 are comparatively larger than embryos of Chelydra serpentina. 



279 



